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Linear lichen planopilaris of the trunk: first report of a case
1Department of Pathology, Division of Dermatology, SMBD-Jewish General Hospital, McGill University, Montreal, QC.
Background:
Lichen planopilaris (LPP) is believed to be a follicular variant of lichen planus that affects pilosebaceous units, mainly of the scalp. An extremely rare variant of LPP is a linear form, which follows the lines of Blaschko. Of the five previously documented cases of linear LPP, all were limited to the face.
Objective:
We report the case of a 34-year-old male who presented with a nonpruritic eruption on the trunk consisting of erythematous, keratotic, folliculocentric papules following Blaschko's lines.
Results:
Biopsy revealed lichenoid and interface dermatitis involving the basilar epidermis and hair follicles, as well as apoptotic keratinocytes, consistent with LPP.
Conclusion:
This represents the first documented case of LPP, following the Blaschko's lines, in a nonfacial distribution.
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